I was able to get /home mounted and copy my data off. Here is what I did
---------------------------------------------------------
sudo apt-get install qemu
sudo apt install qemu-utils
sudo apt-get install xfsprogs
sudo modprobe nbd max_part=8
sudo qemu-nbd --connect=/dev/nbd0
/media/sf_virtual_machine_share/centoOS7Python3p9_tmp-disk1.vdi
sudo mkdir /mnt/dirNbd0p2
sudo mount -o ro,norecovery /dev/mapper/centos-home /mnt/dirNbd0p2
---------------------------------------------------------
I couldn't get the vdi corruption fixed but I did get my data.
@Dave
Thank you for your help.
Brian
On 09/09/2021 05:09 PM, Dave Chinner wrote:
On Thu, Sep 09, 2021 at 03:11:45PM -0400, brian wrote:
I switched over to ubuntu and got the error "Device or resource busy". How
do I get around this error?
Here is what I did:
---------------------------------------------------------
sudo apt-get install qemu
sudo apt install qemu-utils
sudo apt-get install xfsprogs
sudo modprobe nbd max_part=8
sudo qemu-nbd --connect=/dev/nbd0
/media/sf_virtual_machine_share/centoOS7Python3p9_tmp-disk1.vdi
sudo xfs_repair /dev/nbd0p2
---------------------------------------------------------
I got the error:
---------------------------------------------------------
xfs_repair: cannot open /dev/nbd0p2: Device or resource busy
---------------------------------------------------------
Because /dev/nbd0p2 is not the device the filesystem is on. The
filesystem is on a lvm volume:
brian@brian-VirtualBox:~/Desktop$ sudo lvmdiskscan
/dev/loop0 [ 219.00 MiB]
/dev/loop1 [ <55.44 MiB]
/dev/sda1 [ 512.00 MiB]
/dev/nbd0p1 [ 1.00 GiB]
/dev/loop2 [ <65.10 MiB]
/dev/nbd0p2 [ <101.71 GiB] LVM physical volume
As noted here.
cmd:
---------------------------------------------------------
sudo lvscan
---------------------------------------------------------
Result:
---------------------------------------------------------
ACTIVE '/dev/centos/swap' [2.00 GiB] inherit
ACTIVE '/dev/centos/home' [<49.70 GiB] inherit
ACTIVE '/dev/centos/root' [50.00 GiB] inherit
---------------------------------------------------------
And these are the devices inside the LVM volume that contain
filesystems/data.
Likely the one you are having trouble with is /dev/centos/root,
but there may be issues with /dev/centos/home, too.
And to answer your other question, "<dev>" is just shorthand for
"<insert whatever device your filesystem is on here>". i.e.
/dev/centos/root in this case...
Cheers,
Dave.
